//
//  Copyright (C) 2010 Vadim Ushakov
// 
//  This program is free software; you can redistribute it and/or modify it
//  under the terms of the GNU General Public License as published by the Free
//  Software Foundation; either version 2 of the License, or (at your option)
//  any later version.
// 
//  This program is distributed in the hope that it will be useful, but
//  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
//  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
//  for more details.
//  
//  You should have received a copy of the GNU General Public License along
//  with this program; if not, write to the Free Software Foundation, Inc.,
//  59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
//


#include "kernelHEventTable.h"
#include <sys/errors.h>

static struct {
	kernelHEventHandler handler;
} heventHandlers[machHEventCount];


int kernelRegisterHEventHandler(int firstHEvent, int heventCount, kernelHEventHandler handler)
{
	int status;
	int i;

	if (handler == 0 || firstHEvent < 0 || firstHEvent + heventCount > machHEventCount)
		return (status = ERR_INVALID);

	for (i = firstHEvent; i < firstHEvent + heventCount; i++)
	{
		if (heventHandlers[i].handler != 0)
			return (status = ERR_BUSY);
	}

	for (i = firstHEvent; i < firstHEvent + heventCount; i++)
	{
		heventHandlers[i].handler = handler;
	}
	return (status = 0);
}

void kernelCallHEventHandler(int hevent, machHEventState* state)
{
	if (hevent < 0 || hevent >= machHEventCount)
	{
		//FIXME: panic here
		return;
	}
	if (!heventHandlers[hevent].handler)
		return;
	heventHandlers[hevent].handler(hevent, state);
}

